2 Familiar Names Crack List of Top 10 Billionaires

Forbes' annual compilation of the wealthiest people on Earth is out, and the list welcomes a couple of flush newcomers to the richest of the rich. Bill Gates retains his top spot with $75 billion to his name, while for the first time, Facebook founder Mark Zuckerberg cracks the top 10, coming in at No. 6 with a net worth of $44.6 billion. Amazon's Jeff Bezos also debuts in the top 10, just squeaking by Zuckerberg to take the No. 5 spot with $45.2 billion. Meanwhile, Donald Trump—who's previously boasted of a net worth of $10 billion—doesn't fare as well as he may have desired: The GOP front-runner only manages to tie a whole bunch of other billionaires for the No. 324 spot, with a meager $4.5 billion. Overall, the list found 1,810 billionaires worldwide—16 fewer than last year.

Here's the net worth of the top 10, along with the source of their wealth:

1. Bill Gates, Microsoft: $75 billion
2. Amancio Ortega, Zara: $67 billion
3. Warren Buffett, Berkshire Hathaway: $60.8 billion
4. Carlos Slim Helu, telecom industry: $50 billion
5. Jeff Bezos, Amazon: $45.2 billion
6. Mark Zuckerberg: $44.6 billion
7. Larry Ellison, Oracle: $43.6 billion
8. Michael Bloomberg, Bloomberg LP: $40 billion
9. Charles Koch and David Koch, diversified: $39.6 billion (each)

(Head to Forbes for the entire list, especially if you want to see how people like unhappy billionaire Jack Ma, Rupert Murdoch, and George Lucas rank .)